1564363661 has 16 divisors (see below), whose sum is σ = 1850054400. Its totient is φ = 1321976880.

The previous prime is 1564363639. The next prime is 1564363667. The reversal of 1564363661 is 1663634651.

It is not a de Polignac number, because 1564363661 - 2⁶ = 1564363597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1564363667) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7766 + ... + 56471.

It is an arithmetic number, because the mean of its divisors is an integer number (115628400).

Almost surely, 2^1564363661 is an apocalyptic number.

It is an amenable number.

1564363661 is a deficient number, since it is larger than the sum of its proper divisors (285690739).

1564363661 is an frugal number, since it uses more digits than its factorization.

1564363661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64329 (or 64315 counting only the distinct ones).

The product of its digits is 233280, while the sum is 41.

The square root of 1564363661 is about 39552.0373811514. The cubic root of 1564363661 is about 1160.8583769979.

The spelling of 1564363661 in words is "one billion, five hundred sixty-four million, three hundred sixty-three thousand, six hundred sixty-one".